正交各向异性介质地震弹性波场的伪谱法正演模拟

Elastic wavefield forward modeling with pseudo-spectral method in orthorhombic anisotropy media

1. 中海石油研究中心勘探研究院,高碑店074010;2. 长春科技大学,长春130026

Exploration Institute of CNOOC Research Center, Gaobeidian 074010

自Bush和Crampin等人用ORA介质模型成功地解释了巴黎盆地观测到的横波分裂异常以来,正交各向异性问题的研究已引起了地球物理学界极大的兴趣和重视。现在,地球物理学界也越来越意识到,对于许多地球物理问题,正交各向异性可能是最简单的实际介质模型。

The study of orthogonal anisotropy has arisen great interesting and attentions in the geophysical circles, since Bush, Crampin and some others successfully deciphered the S wave splitting anomalousobserved in the Paris Basin by using ORA medium model. Geophysicists come to realize that orthogonal anisotropy may be the most realistic and simplest medium model for many a geophysical problems. Based on the wave equations established in general coordinate system for orthorhombic anisotropy media, this paper discussed the stability conditions for numerical calculations of wavefields using pseudo spectral method. Forward modeling of elastic wavefields was then performed on the orthorhombic anisotropy media. Excellent results have been reached.